Need help selling amp, LORD JESUS!

I have a Marshall Jvm-410h 100 watt head its a valve head.Nothing wrong with it but i made a mistake buying it as i have gone off its tone. But holy jesus how do i get rid of it?I paid around £650 for it and i think i want around £400 if i sold it

You'll get potentially hundreds of amp shoppers looking at your amp if you put it on ebay. If you offer a good price, which you are... then its bound to sell. As long as u dont live in the middle of nowhere because i assume you're going to offer pick up.

Given the shape of the market right now, you may get a better deal if you trade it tbh. You won't technically gain or loss money right away, but a good trade will put you ahead in the long run in terms of the value of the item you receive.